Jira Software Boards
SINCE VERSION 3.5.0 it is possible to calculate values in Kanban and Scrum Boards!
Scrum boards
In Scrum Boards it is possible to activate the calculation per column and swimlane:

Kanban boards
In Kanban Boards it is possible to activate the calculation per column and swimlane:

Configuration
The calculation can be configured by going to the board configuration → sumUp configuration:

Activating the calculation row
To use sumUp with Jira Core, make sure it is activated in Global settings under Manage apps. Otherwise, the buttons will not be displayed.

You can use the toggle switch to enable or disable the gadget.
To permanently activate it, click the lock icon.